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Obama aide: Russia may be involved in Ukraine violence

A top aide to President Obama says there are signs of Russia involvement in new violence in eastern Ukraine. Samantha Power, ambassador to the United Nations, told ABC's This Week that gun battles between

If that is the case, Power said there will likely be more economic sanctions on Russia, penalties she says are already starting to "bite" its economy. The value of the ruble and the stock exchange are down, and "investors are fleeing," she said.

"The President has made clear that depending on Russian behavior, sectoral sanctions against energy, banking, mining could be on the table," Power said. "And there's a lot in between."